Openssl tool for workbench
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OPENSSL TOOL FOR WORKBENCH MANUAL
The OpenSSL manual describes the usage of the GCM and CCM modes here: Manual:EVP_EncryptInit(3)#GCM_Mode. The tag is subsequently used during the decryption operation to ensure that the ciphertext and AAD have not been tampered with. The output from the encryption operation will be the ciphertext, and a tag. An example of AAD is the IP address and port number in a IP header used with IPsec. The AAD data is not encrypted, and is typically passed to the recipient in plaintext along with the ciphertext. In addition you can (optionally) provide some Additional Authenticated Data (AAD).
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Mode (currently only GCM and CCM are supported).Algorithm (currently only AES is supported).
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Using AEAD modes is nearly identical to using standard symmetric encryption modes like CBC, CFB and OFB modes.Īs with standard symmetric encryption you will need to know the following: There are a number of AEAD modes of operation. The MAC tag will ensure the data is not accidentally altered or maliciously tampered during transmission and storage. Such Authenticated-Encryption with Associated-Data (AEAD) schemes provide confidentiality by encrypting the data, and also provide authenticity assurances by creating a MAC tag over the encrypted data. The EVP interface supports the ability to perform authenticated encryption and decryption, as well as the option to attach unencrypted, associated data to the message.