After gaining access to the password hashes used to protect access to a web based application, knowledge of which cryptographic algorithms would be useful to gain access to the application?

SHA1 is a one-way hashing algorithm commonly used to store password digests. Knowing the target application uses SHA1 allows an attacker to precompute rainbow tables or run brute-force attacks generating SHA1 hashes to match against the stolen hashes, ultimately recovering plaintext passwords.

Diffie-Hellman is a key exchange protocol used to establish shared secrets, not a password hashing algorithm, so it would not be involved in protecting stored credentials.

RSA is an asymmetric encryption algorithm used for digital signatures and key exchange, not for hashing or storing passwords.

AES is a symmetric encryption cipher, not a hashing function, and is not typically used to create password digests stored in web applications.