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Aes-Gcm how to perform decryption authentication without plaintext output in C#

I’m mainly trying to verify large file chunks which are encrypted each alone with a different key/salt/nonce for each chunk then appended to the whole file in the end to form 1 file.

One thing I wanted to implement was the principle of not outputting plain data of any chunk to the user unless every chunk of the file authenticates successfully. If 1 fails, the whole operation fails.

To do this, if the file has multiple chunks, I do 1 pass to authenticate all chunks, then another pass to decrypt them if the first pass authenticates.

I’m using the library provided by .net to do this and it seems to output the plain chunk to a span if that chunk authenticates which would technically put the decrypted chunk in memory, technically allowing someone to see what’s happening in the memory for the time it is there. How am I supposed to ONLY authenticate without doing any output whatsoever to any destination, and can that library do it somehow (i.e. am I missing anything?) or should I use another library that provides this functionality?

It seems very odd to me that this is the behaviour, compare it to a group of people standing outside your door, you ask their ID one by one but it doesn’t mean that will let them enter automatically if they verify successfully.. maybe you want the full group in at once..

While the Bear Market’s Claws Drag ETH Prices Down, Ethereum Network Fees Remain Low

While ethereum prices jumped 61% higher during the last 30 days, the crypto asset’s U.S. dollar value is still down more than 60% lower than ether’s all-time high recorded nine months ago. Amid the market downturn, the network’s average fees have been lower than $5 per transaction and on July 30, at 9 p.m. (ET),::Listen

While ethereum prices jumped 61% higher during the last 30 days, the crypto asset’s U.S. dollar value is still down more than 60% lower than ether’s all-time high recorded nine months ago. Amid the market downturn, the network’s average fees have been lower than $5 per transaction and on July 30, at 9 p.m. (ET), the average fee was roughly 0.001 ether or $1.70 per transfer. Moreover, the Gas Tracker on etherscan.io recorded even cheaper transfers this weekend, as transactions in the $0.18 to $0.66 range have been confirmed by ethereum miners.

Ethereum’s Average and Median-Sized Network Fees Remain Low


Ethereum is more than 60% less valuable than it was on November 10, 2021, but network transfer fees have been much lower these days. Data shows on July 30, Ethereum’s average transaction fee was roughly 0.001 ETH or $1.70 per transfer.

Median-sized fees on the network have been even cheaper at 0.00039 ETH or $0.663 per transaction. Ethereum’s average transaction fees in July did not surpass the $5 mark. Additionally, Ethereum’s median-sized fees did not cross the $2.50 mark per transfer in July.



Data transfers at the end of July on the Ethereum network indicate transfer costs recorded by etherscan.io’s Gas Tracker were a lot lower than bitinfocharts.com estimates. Gas Tracker stats say an Opensea sale on July 30 could cost a user $0.86, an Uniswap trade was estimated to cost $2.21, and an ERC20 transfer on Saturday was around $0.65.

Layer Two Fees Hang Below $0.50 per Transfer or Swap


Low through high Ethereum network transfer fees recorded by etherscan.io were between five to six gwei per transfer on July 30. These values are a lot different from the transfer costs recorded nine months ago when ETH reached $4,878 per unit.

At that time, bitinfocharts.com metrics detail that the average ETH transfer fee was around $29 per transfer. A snapshot recorded on archive.org shows etherscan.io’s Gas Tracker charted cheaper transaction rates.

While July 30 fees were between five to seven gwei, the lowest fee on November 9, 2021, was 171 gwei or $12.83 per transfer. The cost of an ERC20 transaction was $39.71 and a decentralized exchange (dex) trade was $122.18.

With Ethereum network fees so low, layer two (L2) fees recorded on July 30 were even lower. A Loopring transfer was $0.02 and to swap tokens, the cost was $0.39. ZKSync transactions were $0.05 and token swaps were roughly $0.13. Optimism and Arbitrum have the highest L2 fees with $0.21 to $0.25 per transaction and $0.31 to $0.41 per swap.

What do you think about Ethereum fees continuing to remain low during the last 30 days? Let us know what you think about this subject in the comments section below.

Aes-Gcm how to perform decryption authentication without plaintext output in C#

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